<!DOCTYPE html>
<style>
    p {
        color: transparent;
    }
    @media (resolution: 1dppx) {
        p {
            font-size: 1px;
        }
    }
    @media (resolution: 2dppx) {
        p {
            font-size: 2px;
        }
    }
    @media (resolution: 3dppx) {
        p {
            font-size: 3px;
        }
    }
</style>
<p>Test</p>

